Mechanism for varying the stroke of internal-combustion engines.



W. M'. AUSTIN. MEOHANISM FOR VARYING THE STROKE or INTERNAL GoMBUsTIoNENGINES.

N -APPLIOATION FILED DBO.30.1912.

Patented Nov. 24, 1914.

'gli ESSS 'g' XVALTER M. AUSTIN, OF SWISSVALE, IJSNNSYLVANIA.

MECI-IANISllf' FR 'VARYINGr THE STOKE OF INTERNAL-COMBUSTIUN ENGINES.

amener.

Application len December 30, 1912.

To 0U Lc/mm it Way concern Be it known that lVALTnn M". ims'rm, acitizen of the United Stfites,nesi li1ig at Swissvale, in the county ofAllegheny and State ot' Pennsylvania, have invented new and usefulln'iprovenients in Mechanism 'for Varying the Stroke ofInternal-Coniloustion llngines, ol which the following is aspecification.

This invention relatos to internal cornbnstion engines of the type inwhich the combustible fluid mixture is compressed before ignition.

The principal object of my invention is to provide an iniproved internalcombustion engine in which the products of con1- bastion are completelyexpelled .from the working cylinder before the introduction of a freshcharge ot' combustible mixture and in which an increased expansiveeffect is secured Afor a given volume of combustible mixture.

lin an internal combustion engine it is highly desirable to thoroughlyscavengo the working cylinder et the products oi com bustion so as toprevent contamination ot' the fresh charge of combustible mixture whichis drawn in on the next stroke o't the engine for various reasons wellknwn t0 those skilled in the art and which the e fore need not heenumerated here. By providing a larger etilective expansion volume morepower is secured 'trom a given charge o't fuel.

In the accompanying drawing; Figure l is acentral verti'ail section oi asix cylinder internal combustion engine embodying my improvements; Fig.2 a top plan view ol.' the crank shaft therefor; Fig. 3 a sectionthrough the crank shaft on the line ro-uot Fig. l, looking in thedirection of the arrows; Fig. Al a, similar section on the lint` om?)oil Fig. it; Fig. 5 is a Similar section on the line (rw-o ot Fig'. 1;Fig. G an end View ot the .main crank shaft looking at the right handend; and Fig. 7 a section' of the main crank shaft on the line fl-do'fFg. 1.

The invention is adapted to be employed -with internal combustionengines having;V

two or .more workingr cylinders and as an instance ot' one lapplicationof my invention7 l have shown and described the Same as applied to a sixcylinder' engine.

7 As shown in Fig. 1 of the drawing, the

usual engine casing l is provided having Specification of LettersPatent.

"atcnted Nov. 24, 19146.

Serial No. 789,238.

.cylinders 2, 3, Ll, 5, (3, and 7 containin f the rods 14, l5, '1(3,1718, and 1.9. A main vcrank shaft l0 is joi-lrnaled in hearings in theengine casini;y 'l and has crank pins 21, 22, 24, and 'tor therespective connecting rods lat, l5, 1S, and 1t), the connecting rods i6and 'i7 beingr applied to a common crank pin 23. lhe crank pins 21 and25 a're in a..ial alincment as also the crank pins 22 and 24, and thepairs of crank pins so formed are spaced 12d degrees apart. Intermediatethe crank pins 22 and 2.3 and 512i and Qt the crank shaft is providedwith bearing members QG and Q7, preferably ball bearings, and saidbearing members may either be integral withthe crank shaft, as shown, ormay be suitably secured thereto. 0n opposite sides of the bearingmembers Qt and 2T are elongated bosses 28 which extend -from the crankpins and it to the crank pin i3 md form with the nternuuliate bearingmember the crank portion 'tor said crank pins, as more clearly shown inFigs. 2 and 7.

The connecting rods are not mounted directly on the main crank shaft buthave intermediate auxiliary cranks or eccentrics, the connecting;rodslfi, 15, 18, and 19 being rotatably mounted on the respectiveauxiliary cranks QS), 30, 31, and 32 and the connecting rods 16 and 17being mounted on auxiliary cranks 33 and 34 integrally connectedtogether as shown.

The engine arranged so that the conipigession and expansion strokes ofone en- 4niddle pair of pistons 10 and '1,1 have the correspondingauxiliary cranks 33 and 34 integrally connected together with theecccntricity of the cranks arranged substantially 180 degrees apart, thedouble crank being preferably :Formed in halves, as shown in Fig. 3, andsecured together on the main crank shaft by bolts (not shown). Theauxiliary cranks .for the respectivo connecting' other pistons aresimilarly arranged, baul-ln Cillin THON, Y

he l@ zum au. u

if; the en- 7x7 *he Same nummer., by

3 mason A Jim1 batw i the cranks The main Crank q d :Lugli-Haga a fembalance as ma ee-Jnicmas 0i vides@ m the usual six Ender enginesubsanalj 180 :le :m for the same reason pe' to ispose is ahw the ma*with 'the ha piston?. as Shown; a middle pair, and 'the Stemmi pai? witha piston on either side Sucicx. SMG? mi p f desl'e, however, tha paifsme s v ali be arrangfad the Same as 'fh is apen o 'he iiotwnion @i 'theintegrally lary cranks and s@ L an interna?. combustion engine, thecombinm n Wh *Emu* cylinders, a piston in each cyhme'f, a @um i shaftprovided with cfentml azanx pin and a crank pin im @am Side of thecentral @rank pin, zmc connecb ing ms fm* @pelatively connecting the twouppermost position. This' said gears.

2. In an internal combustion engine, the combination with a Ipluralityof cylinders, a piston in each cylinder, a. crank shaft provided withcrank pins, and connecting rods for operatively connecting said pistonsto crank pins, ofan eccentric mounted on the outer crank pin at eachside, a gear secured to each eccentric, an internal gear 4meshingIWith'each eccentric gear and carrying an external gear, gears meshingwith sa1d external gears, and a shaft for connecting the last mentionedgears. 3. In an internal combustion engine, the combination with aplurality of cylinders and a iston in each 'c linder, of a main crank saft, two integra ly connected auxiliary cranks rotatably mounted on themain crank shaft, a connecting` rod for operatively connecting eachauxiliary crank ywith one of the pistons, other auxiliary cranks, trainsof gea ring :for operatively connecting the last mentioned cranks inpairs, and a connecting rod for operatively connecting h each of saidcranks with one of the remaining pistons.

4. In an internal combustion engine, the combination. with a pluralityof and a iston in each cylinder, o a main crank s aft, two integrallyconnected auX- iliary cranks rotatably mounted on the main crank shaft,a connectingrod for operatively connecting each auxiliary crank with oneof the middle pairs of pistons, an aux-` iliar crank rotatably mountedon the main shaft on opposite sides of the middle pair of auxiliarycranks, gearin for opfcylinders eratively connectin the second pair ofauxiliary cranks, a tiird pair of auxiliary cranks rotatably mounted onthe main crank shaft on opposite sides of the second pair of auxiliarycranks, gearing for o erativelyconnecting the auxiliary cranks ot thethird pair, and a connecting rod for operatively connectin eachauxiliary crank of the sec ond and tii'rd pairs with a piston of theeneine.

b In testimony whereof I have hereunto set my hand.

\VALTER M. AUSTIN. Witnesses:

A. M. CLnMnNTs, B. A. OLIVER.

